Water gun



FIG. 1 is a front elevation view of a water gun showing my new design of which the opposite side being a symmetry image of that shown;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a water gun, as shown and described. 